Keith left downtown Burbank, and 3 hours later Sally left going 68 mph faster to catch up. After another 2 hours Sally caught up. Find Keith’s average speed.

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m